The main character in 'Mr President' manga is usually seen as David. He faces numerous obstacles and makes tough decisions as he tries to fulfill his presidential duties while maintaining his integrity.
I found a novel similar to Mr. Dior's manga. This novel was called " A Kryptonite from a Beautiful Manga ". It was a manga novel with the main character Rorschach from Kryptonia. He was extremely powerful and led the Justice League and the Emperor Organization to explore the multiverse. This novel might suit your taste.
I think it could potentially center around a relationship or a mission that emerges from this contract. But to know for sure, you'd have to read the manga itself.
I recommend a manga/novel,"My Manga Life", which tells the story of the protagonist's rise in the manga world after he transmigrated and became a manga artist. The novel was filled with celebrities, assistants, editors, and all kinds of characters in the entertainment industry. At the same time, there were many detailed descriptions of manga creation, which was very suitable for readers who liked manga and animation. I hope you like my recommendation.
Mr. Wu Liu was Tao Yuanming, an ancient Chinese writer, statesman, lecturer, and calligrapher.
Mr. Fan Chuan was a famous writer of the Ming Dynasty, Feng Menglong. His masterpieces include Yu Shi Ming Yan and Jing Shi Tong Yan.
Mr. Linchuan was a Tang Dynasty poet Wang Zhihuan's representative work,"Climbing the Stork Tower."
Mr. Liao Zhai was Pu Songling, a novelist of the Qing Dynasty. His masterpiece was Strange Tales from a Chinese Studio.